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	<title>YUI Library Examples: Slider Control: Dual-thumb Slider with range highlight</title>
    

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    #demo_bg {
        position: relative;
        background: url(../slider/assets/dual_thumb_bg.gif) 0 5px no-repeat;
        height: 28px;
        width: 310px;
    }

    #demo_bg div {
        position: absolute;
        cursor: default;
        top: 4px;
    }

    #demo_bg span {
        position: absolute;
        background: url(../slider/assets/dual_thumb_highlight.gif) 0 0 repeat-x;
        _font-size: 5px; /* prevent IE6 expanding the box height to font-size */
        top: 10px;
        left: 12px;
        height: 13px;
        width: 288px;
    }

    #demo_bg .caution {
        background-position: 0 -13px;
    }
    #demo_bg .boom,
    #demo_bg .danger {
        background-position: 0 -26px;
    }
    p .ok {
        color: #3a3;
        font-weight: bold;
        text-transform: uppercase;
    }
    p .caution {
        background: #ff3;
        color: #770;
        font-weight: bold;
        font-style: italic;
        padding: 0 1ex;
        text-transform: uppercase;
    }
    p .danger {
        color: #f33;
        font-weight: bold;
        text-decoration: blink;
        text-transform: uppercase;
    }
    p .boom {
        color: #fff;
        background: #000;
        padding: 0 1ex;
    }
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	<div id="pagetitle"><h1>YUI Library Examples: Slider Control: Dual-thumb Slider with range highlight</h1></div>
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	<h1>Slider Control: Dual-thumb Slider with range highlight</h1>
	
	<div class="exampleIntro">
	<p>This example demonstrates a horizontal dual-thumb Slider with custom code to add a highlight to the bounded range.  Some characteristics to note include the following:</p>
<ul>
    <li>The thumbs are set on a slide bar with a 300 pixel range.</li>
    <li>The thumbs are configured with a 12 pixel tick size.</li>
    <li>Clicking on the background will move the nearest thumb.</li>
</ul>
			
	</div>	
					
	<div class="example-container module ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="slider_dual_with_highlight_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->		
		</div>		<div id="example-canvas" class="bd">
	
		
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
	
	<div id="demo_bg" title="Range slider">
    <span id="demo_highlight"></span>
    <div id="demo_min_thumb"><img src="assets/l-thumb-round.gif"></div>
    <div id="demo_max_thumb"><img src="assets/r-thumb-round.gif"></div>
</div>
<p>Range offsets: <span id="demo_range">0 - 300</span></p>
<p>Status: <span id="demo_value" class="ok">ok</span></p>

<script type="text/javascript">
(function () {
    YAHOO.namespace('example');

    var Dom = YAHOO.util.Dom;

    // Slider has a range of 300 pixels
    var range = 300;

    // Set up 12 pixel ticks
    var tickSize = 12;

    // Some arbitrary ranges to cue status changes
    var caution_range = 150,
        danger_range  = 75,
        boom_range    = 13;

    YAHOO.util.Event.onDOMReady(function () {
        var reportSpan     = Dom.get("demo_range");
        var calculatedSpan = Dom.get("demo_value");

        // Create the DualSlider
        var slider = YAHOO.widget.Slider.getHorizDualSlider("demo_bg",
            "demo_min_thumb", "demo_max_thumb",
            range, tickSize);
        
        // Decorate the DualSlider instance with some new properties and
        // methods to maintain the highlight element
        YAHOO.lang.augmentObject(slider, {
            _status : 'ok',
            _highlight : Dom.get("demo_highlight"),

            getStatus : function () { return this._status; },

            updateHighlight : function () {
                var delta = this.maxVal - this.minVal,
                    newStatus = 'ok';
                
                if (delta < boom_range) {
                    newStatus = 'boom';
                } else if (delta < danger_range) {
                    newStatus = 'danger';
                } else if (delta < caution_range) {
                    newStatus = 'caution';
                }

                if (this._status !== newStatus) {
                    // Update the highlight class if status is changed
                    Dom.replaceClass(this._highlight,this._status,newStatus);
                    this._status = newStatus;
                }
                if (this.activeSlider === this.minSlider) {
                    // If the min thumb moved, move the highlight's left edge
                    Dom.setStyle(this._highlight,'left', (this.minVal + 12) + 'px');
                }
                // Adjust the width of the highlight to match inner boundary
                Dom.setStyle(this._highlight,'width', Math.max(delta - 12,0) + 'px');
            }
        },true);

        // Attach the highlight method to the slider's change event
        slider.subscribe('change',slider.updateHighlight,slider,true);

        // Create an event callback to update some display fields
        var report = function () {
            reportSpan.innerHTML = slider.minVal + ' - ' + slider.maxVal;
            // Call our conversion function
            calculatedSpan.innerHTML =
            calculatedSpan.className = slider.getStatus();
        };

        // Subscribe to the slider's change event to report the status.
        slider.subscribe('change',report);

        // Attach the slider to the YAHOO.example namespace for public probing
        YAHOO.example.slider = slider;
    });
})();
</script>
	
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
	
		
		</div>
		
	
	</div>			
	</div>
		
	<h2 class="first">Adding a range highlight to a dual thumb Slider</h2>
<p>DualSlider does not come prebuilt with support for a range highlight.  This example demonstrates how to add this functionality to a DualSlider.</p>
<p>You supply your own markup for the slider. Keep in mind the following points about markup for <a href="http://developer.yahoo.com/yui/slider/#dual">YUI Dual Thumb Slider Control</a> implementations:</p>
<ul>
<li>The thumb elements should be children of the slider background.</li>
<li>We use <code>&lt;img&gt;</code> elements rather than a CSS background for the thumbs to get around a performance bottleneck when animating thumb positions in IE.</li>
<li>Don't apply a CSS border to the slider background.</li>
<li>The background element should have an explicit CSS position: <code>relative</code> or <code>absolute</code>.</li>
<li>Both thumb elements should have an explicit CSS position: <code>absolute</code> and be initially placed at the zero position of the background.  Set their initial position in the constructor if desired.</li>
</ul>

<h2>CSS:</h2>
<p>The example will use the css sprites technique to change the color of the highlight based on assigned classes.</p>
<textarea name="code" class="CSS" cols="60" rows="1">
#demo_bg {
    position: relative;
    background: url(../slider/assets/dual_thumb_bg.gif) 0 5px no-repeat;
    height: 28px;
    width: 310px;
}

#demo_bg div {
    position: absolute;
    cursor: default;
    top: 4px;
}

/* Here's the highlight element */
#demo_bg span {
    position: absolute;
    background: url(../slider/assets/dual_thumb_highlight.gif) 0 0 repeat-x;
    _font-size: 5px; /* prevent IE6 expanding the box height to font-size */
    top: 10px;
    left: 12px;
    height: 13px;
    width: 288px;
}

#demo_bg .caution {
    background-position: 0 -13px;
}
#demo_bg .boom,
#demo_bg .danger {
    background-position: 0 -26px;
}

/* We'll use the same class names for the status report region */
p .ok {
    color: #3a3;
    font-weight: bold;
    text-transform: uppercase;
}
p .caution {
    background: #ff3;
    color: #770;
    font-weight: bold;
    font-style: italic;
    padding: 0 1ex;
    text-transform: uppercase;
}
p .danger {
    color: #f33;
    font-weight: bold;
    text-decoration: blink;
    text-transform: uppercase;
}
p .boom {
    color: #fff;
    background: #000;
    padding: 0 1ex;
}
</textarea>

<h2>Markup:</h2>
<p>Here we add an additional <code>span</code> element to use as our highlight.</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="demo_bg" title="Range slider">
    <span id="demo_highlight"></span>
    <div id="demo_min_thumb"><img src="assets/l-thumb-round.gif"></div>
    <div id="demo_max_thumb"><img src="assets/r-thumb-round.gif"></div>
</div>
<p>Thumb values: <span id="demo_range"></span></p>
<p>Status: <span id="demo_value"></span></p>
</textarea>

<h2>Code:</h2>
<textarea name="code" class="JScript" cols="60" rows="1">
(function () {
    YAHOO.namespace('example');

    var Dom = YAHOO.util.Dom;

    // Slider has a range of 300 pixels
    var range = 300;

    // Set up 12 pixel ticks
    var tickSize = 12;

    // Some arbitrary ranges to cue status changes
    var caution_range = 150,
        danger_range  = 75,
        boom_range    = 13;

    YAHOO.util.Event.onDOMReady(function () {
        var reportSpan     = Dom.get("demo_range");
        var calculatedSpan = Dom.get("demo_value");

        // Create the DualSlider
        var slider = YAHOO.widget.Slider.getHorizDualSlider("demo_bg",
            "demo_min_thumb", "demo_max_thumb",
            range, tickSize);
        
        // Decorate the DualSlider instance with some new properties and
        // methods to maintain the highlight element
        YAHOO.lang.augmentObject(slider, {

            // The current status
            _status : 'ok',

            // The highlight element
            _highlight : Dom.get("demo_highlight"),

            // A simple getter method for the status
            getStatus : function () { return this._status; },

            // A method to update the status and update the highlight
            updateHighlight : function () {
                var delta = this.maxVal - this.minVal,
                    newStatus = 'ok';
                
                if (delta < boom_range) {
                    newStatus = 'boom';
                } else if (delta < danger_range) {
                    newStatus = 'danger';
                } else if (delta < caution_range) {
                    newStatus = 'caution';
                }

                if (this._status !== newStatus) {
                    // Update the highlight class if status is changed
                    Dom.replaceClass(this._highlight,this._status,newStatus);
                    this._status = newStatus;
                }
                if (this.activeSlider === this.minSlider) {
                    // If the min thumb moved, move the highlight's left edge
                    Dom.setStyle(this._highlight,'left', (this.minVal + 12) + 'px');
                }
                // Adjust the width of the highlight to match inner boundary
                Dom.setStyle(this._highlight,'width', Math.max(delta - 12,0) + 'px');
            }
        },true);

        // Attach the highlight method to the slider's change event
        slider.subscribe('change',slider.updateHighlight,slider,true);

        // Create an event callback to update some display fields
        var report = function () {
            reportSpan.innerHTML = slider.minVal + ' - ' + slider.maxVal;
            // Call our conversion function
            calculatedSpan.innerHTML =
            calculatedSpan.className = slider.getStatus();
        };

        // Subscribe to the slider's change event to report the status.
        slider.subscribe('change',report);

        // Attach the slider to the YAHOO.example namespace for public probing
        YAHOO.example.slider = slider;
    });
})();
</textarea>

<h2>Configuration for This Example</h2>

<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers.  <a href="http://developer.yahoo.com/yui/articles/hosting/?slider&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>

				</div>
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						<div id="loggerModule" class="yui-skin-sam">
						<h3 class="firstContent">YUI Logger Output:</h3>
								<div id="loggerGloss"><p><strong>Note:</strong> Logging and debugging is currently turned off for this example.</p> 
							<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="slider_dual_with_highlight_log.html">Reload with logging<br />
	 and debugging enabled.</a></span></span></p></div>
	
						</div>
					
				
					<div id="examples">
						<h3>Slider Control Examples:</h3>
	
						<div id="exampleToc">
							<ul>
								<li><a href='../slider/slider-simple.html'>Basic Vertical Slider</a></li><li><a href='../slider/slider-ticks.html'>Horizontal Slider with Tick Marks</a></li><li><a href='../slider/slider-rgb.html'>RGB Slider Control</a></li><li><a href='../slider/slider_vert_swapped.html'>Bottom to top Vertical Slider</a></li><li><a href='../slider/slider_dual_thumb.html'>Horizontal Slider with two thumbs</a></li><li class='selected'><a href='../slider/slider_dual_with_highlight.html'>Dual-thumb Slider with range highlight</a></li><li><a href='../progressbar/pb_basic.html'>Basic Features (included with examples for ProgressBar Control)</a></li><li><a href='../progressbar/pb_events.html'>Events (included with examples for ProgressBar Control)</a></li><li><a href='../button/btn_example14.html'>Slider Button (included with examples for Button Control)</a></li><li><a href='../layout/adv_layout.html'>Complex Application (included with examples for Layout Manager)</a></li>							</ul>
						</div>
					</div>
					
					<div id="module">
						<h3>More Slider Control Resources:</h3>
						<ul>
							<li><a href="http://developer.yahoo.com/yui/slider/">User's Guide</a> (external)</li>
						<li><a href="../../docs/module_slider.html">API Documentation</a></li>
                            
                            
							<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/slider.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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